Engine-indicator.



" UNITED STATES PATENT OFFICE- WILL'IAM FOLWELL LLOYD, OF PHILADELPHIA, PENNSYLVANIA, ASSIGN OR OF ONE-THIRD TO CLARENCE A. STIMPSON, OF PHILA- DELPHIA, PENN SYLVANIA.

ENGINE-INDICATOR- Specification of Letters Patent.

Patented March 13, 1906.

Application filed September 21, 1905. Serial No. 279,461.

To all whom it may concern:

Be it known that I, WILLIAM .FoLwELL LLOYD, a citizen of the United States, and a resident of Philadelphia, in the county of Philadel hiaand State of Pennsylvania, have invented a new and Improved Engine-Indicator, of which the following is a full, clear, and exact description.

The object of my invention is to provide a device by means of which the actual horsepower hours delivered by steam or other engines may be easily and reliably ascertained without necessitating taking an indicatorcard and estimating the power therefrom. In attaining this end I provide an instrument adapted to be attached to the engine and by which a reading is attained accounting for the stroke, piston speed, or number of revolutions and the pressure, so that by multiplying this reading by the diameter of the cylinder in inches the actual horse-power hours delivered may be ascertained.

The invention resides in certain special features of structure and combinations of' port which should be attached to the cylinder or mounted adjacent thereto. I On the bracket a friction-disk 11 is mounted to rotate freely. To this disk a spring, such as 12, (indicated by-broken lines in the drawing,)' should be applied to cause the disk to rotate in one direction, and the disk is caused to rotate in the other direction in unison with the working stroke of the engine by a cord 14,

attached to the disk and to the cross-head of the en ine or by any other reliable means.

Exten ing diametrically across the face of the disk 11 is a rotatable shaft 15, on which is a worm 16, engaging a worm-wheel 17 forming part of a consecutive counter 18, which may be of any desired'form, which is Sustained on the bracket 10. By this means side of the center thereof.

the counter 18 is driven from'the shaft 15,

and the arrangement is such that the counter may be driven in either direction, thus increasing or reducing its reading. Splined on the shaft is a friction-gear 19, which is engaged with the face of the disk 11 and is movable over the same to one or the other Said gear '19 has connection with the free end of an arm 20, which is hung by a linkage 21- and'connected with the rod 22 of a piston 23. The piston 23 operatesin a cylinder 24 and has its lower side exposed to the working pressure of the engine-cylinder through a connection 25. On the opposite or upper side of the piston 23 a spring 26 bears to return the piston against said working ressure. The pressure in the working cylind way the ear 19 is shifted across the face of the disk 11, driving the former at a speed and in the direction corresponding to its position on the disk. It therefore follows that upon the operation of the engine the disk 11 is given a back-and-forth rotation through the cord 14 and spring 12 corresponding to the length of municated to the counter 18 under the con- 'trol, however, of the working pressure.

Hence a reading may be taken from the counter which when multiplied by the diamer moves the arm 20, and in this eter of the working cylinder in inches will find the actual horse-power hours delivered during the period that the apparatus has been in operations During the working stroke the gear 19, under the working pressure in the cylinder, will rise or move outward across the face of the disk 11 ,imparting a positive 0 eration to the counter. Upon the exhaust t erelieved pressure in the cylinder 24 will allow the gear 19 to return to the zero position, (shown in the drawing) and movement will not be communicated by the counter. Ifcompression exists in the engine-cylinder, the complete return of the gear 19 will'be prevented, thus reducing the reading of this counter and taking the compression into the result. Similarly, if the engine be working with a v condenser the partial vacuum roduced will cause the gear 19 to ass to t e opposite side of the center of the isk 11 during the return of the disk under the spring 12, and the benefit of the vacuum will be recorded by the counter. appear that the reading on the counter accu- It will thus rately reflects all of the conditions necessary to a computation of the horse-power excepting the diameter of the cylinder, so that by controlled by the working pressure of the engine for shifting the connection.

2. An engine-indicator having a counter, a gear-disk, means for oscillating the same in unison with the stroke and speed of the engine, a shaft extending across the face of the gear-disk and having connection with the counter, a gear splined on the shaft engaged. with the gear-disk, and means for shiftin the second gear, said means being controlled by the working pressure of the engine.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM FOLWELL LLOYD. Witnesses:

WILLIAM S. MEGONIGAL, J. CLIFFORD BROOKS. 

